• | Auto The TV80 will read all relevant datagrams. If the specified information is provided to the system on more than one telegram format, a built-in priority list will be
used.
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• | NMEA HDT The NMEA HDT datagram provides the true vessel heading. The information is normally provided by a course gyro.
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• | NMEA HDM The NMEA HDM datagram provides vessel heading in degrees magnetic. The datagram is no longer recommended for use in new designs. It is often replaced by the NMEA HDG telegram.
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• | NMEA HDG The NMEA HDG datagram provides heading from a magnetic sensor. If this reading is corrected for deviation, it produces the magnetic heading. If it is offset by variation, it provides the true heading.
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• | NMEA VHW The NMEA VHW datagram contains the compass heading to which the vessel points, and the speed of the vessel relative to the
water.
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